20.C考察副词。A. additionally 附加地;B. alike相似的; C. otherwise 否则,不同地,在不同方面;D. overall整体上说;由上文的事例可知,你不会知道你对其他人会产生什么样的影响。故选C。
考点:考查记叙文阅读
第二节 语法填空 (共10小题,每小题1.5分,满分15分)
If the population of the Earth keeps on increasing at its present rate, there will eventually not be enough resources (21)________(leave) to support life on the planet. By the middle of the 26st century, if present trends continue, we (22)_________(use)up all the oil that drives our cars, for example. Even if scientists develop new ways of feeding the human race, the crowded conditions on the earth will make (23) ______ necessary for us to look for open space somewhere else. But (24)______ of the other planets in our solar system are capable of supporting life at present. One possible solution (25)______ the problem, (26)_________, has recently been suggested by an American scientist, Professor Carl Sagan. Sagan believes (27)_______ before the Earth’s resources are (28)_________(complete) exhausted it will be possible to change the atmosphere of Venus and therefore create a new world almost as large as the Earth(29)
.The difficulty is that Venus is much hotter than the Earth.(30)_________, there is only a tiny amount of water there.
【答案】21.left22.will have used23.it24.none25.to26.however27.that28.completely29.itself
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